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Relative contribution of photo-addition, helper oligonucleotide and RNase H to the antisense effect of psoralen-oligonucleotide conjugates, on in vitro translation of Leishmania mRNAs

Identifieur interne : 004324 ( Main/Exploration ); précédent : 004323; suivant : 004325

Relative contribution of photo-addition, helper oligonucleotide and RNase H to the antisense effect of psoralen-oligonucleotide conjugates, on in vitro translation of Leishmania mRNAs

Auteurs : Emanuelle Pascolo [France] ; Denis Hudrisier [France] ; Brian Sproat [Allemagne] ; Nguyen T. Thuong [France] ; Jean-Jacques Toulme [France]

Source :

RBID : ISTEX:3245568FFAB7443833309DB61736BFA3E1F3CD79

English descriptors

Abstract

Abstract: We investigated the properties of two antisense oligonucleotides, 11αPso and 14TMP, 11 and 14 nucleotides long, respectively, and conjugated to psoralen derivatives. These oligonucleotides were complementary to the mini-exon sequence of Leishmania amazonensis. Upon ultraviolet (UV) irradiation these oligomers were selectively cross-linked to DNA or RNA target sequences, either 14 or 35 nucleotides long. The yield of photo-addition was much lower on the longer targets than on the shorter ones, due to the presence of a hairpin structure. The co-addition of a helper oligonucleotide, whose binding site, on the 35-mer, was adjacent to that of the psoralen-derivatized antisense oligomer, improved the cross-linking efficiency. We then determined the effect of 14TMP on in vitro translation of Leishmania mRNA in cell-free extracts. Non-irradiated antisense oligonucleotide/mRNA complexes reduced the protein synthesis in wheat germ extract but not in rabbit reticulocyte lysate. Conversely, UV irradiation induced a 14TMP-dependent reduction of translation in reticulocyte lysate whereas the inhibition was not improved in the wheat germ extract. These results are discussed with respect to the involvement of RNase-H in the oligonucleotide-mediated effect on protein synthesis.

Url:
DOI: 10.1016/0167-4781(94)90251-8


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">Abstract: We investigated the properties of two antisense oligonucleotides, 11αPso and 14TMP, 11 and 14 nucleotides long, respectively, and conjugated to psoralen derivatives. These oligonucleotides were complementary to the mini-exon sequence of Leishmania amazonensis. Upon ultraviolet (UV) irradiation these oligomers were selectively cross-linked to DNA or RNA target sequences, either 14 or 35 nucleotides long. The yield of photo-addition was much lower on the longer targets than on the shorter ones, due to the presence of a hairpin structure. The co-addition of a helper oligonucleotide, whose binding site, on the 35-mer, was adjacent to that of the psoralen-derivatized antisense oligomer, improved the cross-linking efficiency. We then determined the effect of 14TMP on in vitro translation of Leishmania mRNA in cell-free extracts. Non-irradiated antisense oligonucleotide/mRNA complexes reduced the protein synthesis in wheat germ extract but not in rabbit reticulocyte lysate. Conversely, UV irradiation induced a 14TMP-dependent reduction of translation in reticulocyte lysate whereas the inhibition was not improved in the wheat germ extract. These results are discussed with respect to the involvement of RNase-H in the oligonucleotide-mediated effect on protein synthesis.</div>
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